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-rw-r--r--include/linux/string.h1
-rw-r--r--mm/util.c18
2 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/string.h b/include/linux/string.h
index e4c755860316..4f69ef9e6eb5 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -99,6 +99,7 @@ extern void * memchr(const void *,int,__kernel_size_t);
#endif
extern char *kstrdup(const char *s, gfp_t gfp);
+extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
#ifdef __cplusplus
}
diff --git a/mm/util.c b/mm/util.c
index 7368479220b3..e14fa84ef39a 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -40,6 +40,24 @@ char *kstrdup(const char *s, gfp_t gfp)
}
EXPORT_SYMBOL(kstrdup);
+/**
+ * kmemdup - duplicate region of memory
+ *
+ * @src: memory region to duplicate
+ * @len: memory region length
+ * @gfp: GFP mask to use
+ */
+void *kmemdup(const void *src, size_t len, gfp_t gfp)
+{
+ void *p;
+
+ p = ____kmalloc(len, gfp);
+ if (p)
+ memcpy(p, src, len);
+ return p;
+}
+EXPORT_SYMBOL(kmemdup);
+
/*
* strndup_user - duplicate an existing string from user space
*